The GCF is 1.
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The GCF of 19 and 20 is 1.
The greatest common factor of 12 and 20 is 4
greatest common factor of 200 and 180 is 20.
The Greatest Common Factor (GCF) of 20, 24, and 60 is 4
The Greatest Common Factor of 20, 35, 50: 5